chore: drop guacd from compose files and dev runner

scripts/lib/dev-docker.mjs

@@ -85,6 +85,8 @@ export function serviceEnv(options, inDocker) {
     const guacd = SERVICES.guacd;
     env.GUACD_HOST = inDocker ? guacd.container : "127.0.0.1";
     env.GUACD_PORT = String(inDocker ? guacd.port : guacd.hostPort);
+    // Remote desktop runs built in unless told to use guacd.
+    env.REMOTE_DESKTOP_ENGINE = "guacd";
   }
   return env;
 }

scripts/lib/dev-runner.mjs

@@ -125,7 +125,7 @@ Options
   --plugins <dir>  Plugin repos to build and watch (default ../Plugins)
   --no-local       Use only the plugins pinned in docker/bundled-plugins.json
   --db <engine>    sqlite (default), postgres or mysql. Postgres and MySQL run in Docker
-  --guacd          Run guacd in Docker for remote desktop
+  --guacd          Run guacd in Docker and use it instead of the built-in remote desktop
   --fresh          Start from empty data (first run, onboarding)
   --data <dir>     Data folder for the backend (default db/data, db/data-desktop for
                    electron, plus -<engine> for postgres or mysql)